Stop birds, vermin and leaves from getting trapped in your chimney with anti downdraught chimney cowl. Nationwide Chimney Components provides an array of chimney cowls, and our anti downdraught solution is available in terracotta, buff, black, aluminium and raw stainless steel. What’s more, they’re also ideal for keeping the rain out as well as reducing or eliminating downdraught in your chimney. So let’s first look at when down draught or blow back (smoke being blown back into the room) occurs. Most often you will notice downdraught when it is windy or when the wind blows from a certain direction, if this is the case then you have a good chance of eliminating the problem by fitting one of our excellent cowls designed to prevent, stop or reduce downdraught.